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    <div id="app">
        <h3>可折叠面板</h3>
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            <div class="title">
                <h4>自由与爱情</h4>
                <span class="btn">收起</span>
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                <p>生命诚可贵,</p>
                <p>爱情价更高.</p>
                <p>若为自由故,</p>
                <p>两者皆可抛.</p>
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